<template>
  <div class="edit-popup">
    <!-- 我的频道 -->
    <!-- 标题 -->
    <van-cell title="我的频道">
      <van-button size="small" round class="edit-btn" @click="isEdit = !isEdit">
        {{ isEdit ? '完成' : '编辑' }}
      </van-button>
    </van-cell>
    <!-- 频道 -->
    <div class="my-pannel">
      <van-grid :border="false">
        <!-- 动态class :class="{类名:boolean}" -->
        <van-grid-item
          v-for="(item, index) in myChannels"
          :key="item.id"
          :text="item.name"
          :class="{ active: constantChannels.includes(item.name) }"
          @click="onMyChannel(item, index)"
        >
          <template #icon>
            <van-icon
              v-if="isEdit && !constantChannels.includes(item.name)"
              name="cross"
            />
          </template>
        </van-grid-item>
      </van-grid>
    </div>

    <!-- 推荐频道 -->
    <!-- 标题 -->
    <van-cell title="推荐频道" />
    <!-- 频道 -->
    <div class="recommend-pannel">
      <van-grid :border="false">
        <van-grid-item
          v-for="item in recommendChannels"
          :key="item.id"
          :text="item.name"
          @click="$emit('add-channel', item)"
        >
          <template #icon>
            <van-icon name="plus" />
          </template>
        </van-grid-item>
      </van-grid>
    </div>
  </div>
</template>

<script>
// 用配置表的方式替代硬编码
import { getAllChannelsAPI } from '@/api'
export default {
  props: {
    myChannels: {
      type: Array,
      // default: () => []
      required: true
    }
  },
  created() {
    this.getAllChannels()
  },
  data() {
    return {
      // 是否处于编辑状态
      isEdit: false,
      // 不能被编辑, 高亮
      constantChannels: ['推荐'],
      allChannels: []
    }
  },
  // filter: 返回新数组, 回调返回true:保留当前项

  computed: {
    recommendChannels() {
      // 传一个频道的id, 判断这个频道是否在myChannels里
      const isIncludeInMychannels = (id) =>
        !!this.myChannels.find((item) => item.id === id)

      // 所有的频道里 筛选出 我的频道
      // isIncludeInMychannels(item.id) : 看所有频道的每一项 是否在我的频道里
      return this.allChannels.filter((item) => !isIncludeInMychannels(item.id))
    }
  },
  methods: {
    async getAllChannels() {
      const { data } = await getAllChannelsAPI()
      this.allChannels = data.data.channels
    },
    onMyChannel({ id, name }, index) {
      if (this.isEdit) {
        // 如果是编辑状态,而且不应该是推荐, 删除,
        if (!this.constantChannels.includes(name)) {
          this.$emit('delete-channel', id)
        }
      } else {
        // !(a && b) ==> !a || !b
        // 如果不是编辑状态, 跳转
        this.$emit('update-active', index)
      }
    }
  }
}
</script>

<style scoped lang="less">
.active {
  :deep(.van-grid-item__text) {
    color: red;
  }
}

.edit-popup {
  padding-top: 1.33333rem;
}

.edit-btn {
  border-color: red;
  color: red;
  width: 1.38667rem;
  height: 0.64rem;
}

:deep(.van-grid-item__content) {
  width: 175px;
  height: 86px;
  margin: 0 auto 10px;
  background-color: #f4f5f6;
}
.my-pannel {
  // 编辑按钮
  .editBtn {
    width: 104px;
    height: 48px;
    border-color: red;
    color: red;
  }

  // 编辑按钮居中
  .van-cell__value {
    display: flex;
    justify-content: flex-end;
    align-items: center;
  }

  // 关闭按钮样式
  :deep(.van-grid-item__content) {
    position: relative;

    .van-grid-item__icon-wrapper {
      position: absolute;
      top: 0;
      right: 0;

      .van-icon-cross {
        position: absolute;
        top: 0;
        right: 0;
        transform: translate(20%, -35%);
        border: 0.02667rem solid #000;
        border-radius: 50%;
        text-align: center;
        line-height: 0.32rem;
      }
    }
  }
}
// 推荐频道
.recommend-pannel {
  // 推荐频道加号样式
  :deep(.van-grid-item__content) {
    flex-direction: row;

    .van-grid-item__icon {
      font-size: 0.5rem;
    }

    .van-grid-item__text {
      margin-top: 0;
    }
  }
}
</style>
